Vim : Actually numbering the lines

You can always display line numbers inside vim with :set nu , little did I know of a way of actually inserting the line number inside the file .

Here is a cool trick for line numbering

• Number all the lines in Vim


• :%! cat -n 

• Number only a portion of file contents
• First enter the Vim visual mode by pressing v
• select the portion that you want to number
• then :'<,'>!cat -n